I'm a little late to this thread but I'd still like to add my thoughts. I'll try and keep it brief and refrain from repeating what's already been said. I'm sort of glad this thread exists as it confirms what I've been feeling about Revo for quite some time. It's also great to see the MODX team are open to the community and their users.
I'm a freelance website designer/builder, I'd place myself fairly firmly in the middle of design/frontend coder and PHP/database dev. Before the many CMS came along I rolled my own, life was simple (well sort of, in a rose tinted way) I tried out the usual suspects before settling on MODX. I was attracted by the lightweight, speed, small footprint and freedom. I built a few sites using Evo and when Revo was released I jumped straight in after a brief evaluation period. I wasn't unhappy with Evo but saw Revo as the future and the logical progression. I was confident with the team and MODX looked like it was here to stay with active development so I pretty much committed to it.
So I've been almost exclusively developing with Revo, I even moved a few of my Evo sites over to Revo. Over the last year or so Revo has slowly been sapping my enjoyment of developing websites for all the reasons mentioned in this thread, speed, ACLs etc. Without any more nut cracking metaphors this concern has increasingly been at the back of my mind. A switch back to Evo never occured to me and I was quite surprised to see the strong support for Evo in the "back to life" thread. It's so long since I used Evo, but still, switching back doesn't feel right to me.
I would really like to see Revo improved, bit of a diet, speed improvements, less esoteric features (ALCs) I want to be working with something snappy and responsive. If a requirement of Revo is to run on dedicated hosting enviroment then that's fine but it's probably not the solution for me. This is one of the reason I don't use Magento, however it remains the right solution for many, just not for me. As an aside, I currently run my Revo sites on good quality shared hosting with reasonable success.
The Evo/Revo split is a concern, I'd personally like to see a single MODX developed based on Revo with all the benefits of Evo. Not killing off Evo but making Revo a viable move for Evo users. I don't know if this is possible, I hope so. I think two versions could work, I'd see Revo as moving towards MODX "enterprise edition" (using that term loosely) and a MODX "standard edition" whether that be based on Evo or Revo (I'd be using the standard edition). The danger I see is Evo breaking away from MODX and Revo moving in the opposite direction, getting chunkier and more powerful. I wouldn't know which way to go and as I result I'd probably go somewhere else entirely.
Hopefully you can work together, the statements from the core team tell me that the direction of Revo is still driven by the original values that MODX set out with. This post pretty much sums up how I feel about it
https://forums.modx.com/thread/74766/bringing-evo-back-to-life-again?page=20#dis-post-418944
For now, I'm hanging in with Revo, I've invested a lot of time in it. In honesty I have been looking around at alternatives but all face similar challenges. Part of me feels like getting back to the "simplicity" of coding and rolling my own but the practical issues for one guy are obvious.
Good luck all, your work on Evo and Revo is amazing and very much appreciated.
I look forward to seeing the roadmap and timeline.
tl:dr